388 JOURNAL OF FORESTRY 



were classified under five types : Chestnut 50 per cent and over, 

 chestnut under 50 per cent, chestnut oak, white oak, and black oak. It 

 was surprising to find 55 per cent of these plots agreeing with the yield 

 table in volume for sites determined on the basis of height. One 

 reason why more of the plots did not agree was because the average 

 dominant height in the Frothingham Connecticut plots was primarily 

 determined on the basis of chestnut, even for types in which this was 

 not the prevailing tree. Sixty-seven per cent of the chestnut plots 

 agreed in volume and height with the yield table. 



The above comparison wnth Connecticut plots suggests the possible 

 applicability of the table to even-aged, well-stocked, stands of southern 

 upland hardwoods over a wide range of territory, possibly from north- 

 ern Alabama to New England and westward to the Mississippi River. 

 This, however, is a matter for determination and one which can be 

 accomplished for each particular locality by taking a comparatively 

 few plots representing the range of sites present. 



The field of practical use for yield tables in the United States, in 

 predicting the growth of particular stands, is customarily considered 

 to be a very narrow one because of the difficulty of determining what 

 site class to use in a particular case, and because such tables are usually 

 only good for pure stands of a single species or type and which are 

 even-aged and fully stocked, such as form but a small per cent of our 

 forests. The question of site determination in application of the table 

 is fully provided for, however, if the table is carefully tied up to 

 age-height site class curves, such as established in the present case. 

 The table given here also shows the possibilities of covering a wide 

 range of types and species in a general yield table. The field of pos- 

 sible application of such tables in predicting yields of understocked 

 and irregular stands is, the writer believes, susceptible to considerable 

 development. This includes their use for even-aged, understocked 

 stands following clear cutting, or for stands of mixed young and old 

 growth where the latter is about to be removed so as to leave the stand 

 even-aged within broad limits ; also as a useful check on local yield 

 tables made by the stand table method where the rate of growth of the 

 stand is figured from the rate of growth of individual trees of dififerent 

 diameters. In applying the yield table to understocked stands, it would 

 be necessary to determine the present per cent of stocking (compared 

 to well-stocked stands of the yield table), to estimate what this per- 

 centage of stocking will be at different periods in the future, and to 



